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Denon's AH-D2000 high-performance headphones are powered by a 50-mm driver and have a frequency response range from 5 to 45000 Hz with an impedance level of 25 Ohms and 106 dB sensitivity. These lightly used headphones are in excellent condition.

The early 1990s Type II Ei KT90 power tubes in this precisely matched octet were made in the former Yugoslavia. They have welded gray plates and dual O getters. Tubes test as new and are matched for both current draw (mA) and transconductance (Gm).

The GE 6L6GC power tubes in this premium matched quad have gray plates, dual side getters, black bases, and the 188-5 factory code (Owensboro, Ky). Tubes test as new and are precisely matched for both current draw (mA) and transconductance (Gm).

The late 1970s Sylvania 6550 power tubes in this premium matched quad have welded gray plates, 3 getters, and metal collar bases. The blue print on the glass has the Philips ECG logo and matching date codes. Tubes test as new and are precisely matched.

This 1966 Brimar CV4024 / 12AT7WA tube has black wing style plates with copper posts and a halo getter. The white label has the Brimar logo and BVA military insignia, and says "Made in England." Tests as new with very low noise.

This 1950s GE 12AY7 tube has a windmill getter and gray plates shaped like the early Ken-Rad 12AY7s. The tubes in this lot also have a yellow stamp indicating they were selected for Lear Electronics. Tube tests as new with balanced sections.

This rare 1958 Mullard 12AU7 / ECC82 has long plates and an O getter with dual support posts (k61 series). The white label reads "Heath by Mullard" and the Blackburn, UK factory code is etched in the glass. Tube tests as new with very low noise.

This 1958 Mullard EF86 / 6267 tube has mesh plates and a D getter. The white label has the Mullard shield logo and "Made in Gt. Britain" is printed along the bottom. The Blackburn, UK factory code is etched in the glass. Tube tests as new.

The 1963-64 Philips Miniwatt 12AX7 / ECC83 tubes in this precisely matched pair were made in Heerlen, Holland and have the Miniwatt label. Both tubes test as new with balanced sections and phono/V1 grade noise levels.

The 1960s Telefunken 12AX7 / ECC83 tubes in this precisely matched pair have smooth plates and the diamond imprint in the base. The white labels have the Fisher logo. Both tubes test as new with balanced sections and phono grade noise levels.

The early 1960s RCA 7868 tubes in this precisely matched pair have black plates and top and side halo getters. The red label reads "Wurlitzer by RCA." Both tubes test as new and are matched for current draw (51.6 & 53.2 mA) and Gm (100% & 100%).

This 1966 military spec Mullard CV2748 / GZ30 rectifier is a 5Z4 tube type. It has gray plates and a brown base. The white print on the glass reads "CV2748 KB/DA" and the Blackburn, UK factory code is etched in the glass. Tube tests as new.